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Substitution coefficient $\Delta_2$ for eddy-currents

Symbol
$\Delta_2$
Formulae
$0$trefoil arrangement and non-flat formations
$21{m_0}^{3.3} \left(\frac{d_e}{2s_c}\right)^{1.47m_0+5.06}$flat formation, other outer phase (leading 3/T/W)
$0$flat formation, middle phase (1/R/U)
$0.92{m_0}^{3.7} \left(\frac{d_e}{2s_c}\right)^{m_0+2}$flat formation, outer phase with greater loss (lagging 2/S/V)
Related
$d_e$
Equivalent diameter of screen/sheath and armour [mm]
$m_0$
Substitution coefficient $m_0$ for eddy-currents [Hz.m/$\Omega$]
$s_c$
Separation of conductors in a system [mm]
Used in
$\lambda_{12}$
Loss factor of shield by eddy currents